Move shell scripts into sh/ subfolder

sh/setup_web.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -eu
+script_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )
+cd "$script_path/.."
+
+# Pre-requisites:
+rustup target add wasm32-unknown-unknown
+cargo install -f wasm-bindgen-cli
+cargo update -p wasm-bindgen